Device for holding and dressing saws



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1v1. 80111111. DEVICE EOE HOLDING AND DRESSING SAWS. A110.898,981. Patented Feb. 19, 1889.

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M. COVEL. DEVICE POR HOLDING AND DRESSING SAWS. 110.398.031. l Patented Feb. 19, 1889.l

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M. GOVEL. Y DEVICE EOE HOLDING JAND DRESSING sAWs. No. 398g031. Patented Feb. 19, 1889.,

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Mito CovEi., or CHICAGO, intnvois.

DEVICE FOR HLDING AND DRESSING SAWS.

SBECFICATON forming part of Letters Patent No. 398,031, dated February 19, 1889.

Application tiled October 18, 1888. Serial No. 288,455, (No model.)

To (MZ whom, it may concern;

Bc it known that I, MlLO COVEL, of Chicago, county of Cook, and State ot' Illinois, have invented certain new and useful lmprovements in a D evice for Holding and Dressing Saws, of which the vfollowing is afull, clear, and exact description, that will enable others to make and use the saine, reference being had to the accompanying drawings, forming a part of this specification.

The object of this invention is to provide a convenient device `for clamping and holding saws during the operation of dressing the teeth, the improvement being more especially intended Vfor use in connection with straight and band saws, as willbe hereinafterset forth.

Figure 1 is a side elevation of a device embodying my improved features; Fig. 2, a plan or top view of a hand-gage used in connection with the clamping and holding mechanism. Fig. 3 is a vertical transverse section of the cap-plates, the clamping-bars, and the gage illustrated in Fig. 2, the saw being shown in position to be operated upon. Fig. 4 is a similar view as that illustrated in Fig. 3, with this difference: a hand-setting tool being substituted for the hand-gage. Fig. 5 is a vertical transverse section in plane 5, Fig. 1, looking in the direction indicated by the arrow; Fig.l

6, a broken-away side elevation of one of the frames, showing the opposite side from that illustrated in Fig. 1. Fig. 7 is a broken-away detail of t-he upper end oi' one of the adjustable raclebars which support the saw; Fig. 8, a broken-away horizontal section in plane S, Fig. 1; Fig. 9, a broken-away horizontal section in plane 9, Fig. 1. Fig. 10 is a plan or top view of a hand-tool for holding a fiat file for top-dressingthe points of the teeth; Fig. 1l, a similar view of a hand-tool arranged to hold an angular Iile and used in side-dressing the teeth. Fig. 12 is a transversesection of the hand-tool illustrated in Fig. 10, showing the upper part of the saw-holding device and the relative position of these parts; and Fig. 13, a similar view, the hand-tool for sidedressing the teeth. being shown in position for use.

Referring to the drawings, A A represent the ends forming the supportin grame. These end castings will be a little over three feet in height, while the longitudinal dimensions of the machine will be about live feet.

A2 As are horizontal angular cap-plates. The cap-plate A2 is rigidly secured to the highest side ot' the framing ends by means of the bolts a, as shown in Figs. l and 5. The opposite side of the frame is cut away, as at c', so that the companion or movable cap-plate AS can pass just over the same when moving toward or away from the statioinrryv plate A2. The respective ends ot cap-plate A3 are rigidly bolted to the upper ends ot' the vertical levers B B, which are located at each end and just inside of the frame, as shown in Figs. 1, 5, and G. The lower ends ot' thesc levers are pivoted on the bolts a2.

The bars B2 B3, for clamping and holding the saw during the operation of dressing the same, are properly secured to the upper sides of the cap-plates. The cap-plates are provided on the upper side with the shallow recess c3, in which the clamping-bars B2 B3 lit, and thereby prevent a lateral pressure from straining them out of atrue position. The inner adj acent edges of the clamping-bars project a little over the vertical faces of the cap-plates, (see Fig. 5,) so as to clamp the saw on a line with the base of the teeth and hold the same iirmly in a rigid position.

The bolts c4 pass up through the respective ends of the cap-plates A2 A3 and bear against the under side and ends of the saw-clamping bars for the purpose of springing the ends of said bars upward a little when it is desired to dress a straight saw, so as to impart a slight concavity to the cutting-edge-that is, a gradual hollowing from both ends of the saw inl the bars when springing the same upward by,

means of the bolts a4.

The reduced end of the horizontal shaft B4 is provided with suitable j ournal-bearings in the frame, (see Fig. 1,) while the larger or cam part a6 is journaled in the levers B B', as shown in Fig. 5.

Turning the lever-han IOO dlc di, mounted on the shaft Bi, downward has the effect of moving the adjustable capplate A3, carrying' the clamping-bar toward the companion parts and tightly securin the saw o3 in position to be operated upon. The upward or opposite movement ot the handle 0.7 spreads the elamping-jaws and releases the saw.

At each end of the machine and just inside of the frame are located the vertically-adjusts able rack-bars C C', provided in the upper end with the V-shaped notch I), in which rests the back edge of the saw while being dressed. The upper ends ol the rack-bars are also provided with the guide-lugs h', (see Fig. 7,) correspondingly notched, which engage with the opening' iF in the upper part of the tram ing ends, as shown in Fig. 5, and assist in keeping the rack-bars in their proper position. The dotted lines in Fig. 5 indicate the bottom ot' the opening and the position of the lugs D.

C2 is a roch-shaft journaled in the [framing parts near their longitudinal center, and has the pinions if" mounted on thc respective ends thereof, and which engage with the lower toothed ends, D, of the rack-bars. By means ot' the handle if the rock-shaft maybe rotated in either direction in raising` or lowering the rack-baas when b rin ging the saw into proper position. The springs b" are coiled on the i'oclcsliai:`t adjacentto each end, one end of the springs being secured to the bolts lf, set in the shaft, and the opposite ends secured to the pivot-bolts a?. These springs are set so that the pressure of the same will be in an upward direction with reference to the rackbars and autoimttically returns the same to their highest or normal position.

b is the lower guidednacliets (see l `igs. 5 and S) Afor the rack-bars C C', and lf the upper guidednackets, both of which are bolted to the inside of the frame-work. The upper brackets also support the respective ends of the tool-table C". The raclabars are secured in a stationary or fixed posi( ionV b v the handserews C1.v

The rectal lgular hal itl-gage D (see Figs. 9 and S) is provided in each corner with the adjustable screw-bolts d, which project from the under side of the gage-plate. In practice these screw or gage bolts will be set in accordance with the distance it is desired to have the teeth of the saw project above the clamping bars. The saw is first placed loosely in position, the back edge resting in the upper notched ends of the rack-bars. The gagepla-tc D is nextl placed on top of and the saw forced down against the pressure ot' the springs on the rock-shaft C2 until the gagebolts rest upon the clamping-bars, as shown in Fig. Then tighten up on the han dscrews C'1 and secure the rack-bars ina stationary position before relaxing' the pressure of the gageplate D on the saw. Then clamp the saw by rotating the camshaft. The saw is now in position to be operated upon by the hand set shown in Fig. -lor hand-dlc-holding plates shown in Figs. lO, ll, 12, and 13.

The hand-plate D is a tool for holding a tla-t file in top-dressing the teeth, and is cut away on each side, so as to be more conveniently held in the hand. The under side provided with a groove, d', for the reception of the Hat file d?, (see Fig. 12,) and near each end, and on each side of this groove, with the inwardly-projecting ledges di", on which the tile `rests being clamped in place by the screws d". This hand tool or plate is also cut away on the under side to provide the edges d, which project down close Ato the edges of the clamping-bars and come to a gage bearing on the cap-plates as the operation ol iopalressn ing th e teeth p rogresses.

The hand-tool D2 (see Figs. 'll and i3) is designed to hold a three-cornered or angular le for side-dressing the teeth, as shown in Fig. i3. This tool consists of the side plate, d, the top plate, d?, and the bottom or clamping plate, d8. The sideplate is secured to the top plate by screws d". These plates are provided with turncdover edges forminglugs g, so as to be conveniently held in the hand.

The top plate, di, is provided in the under side with the groove g to receive one corner of the file g2, (sce Fig. 13,) and the bottom plate, cl3, cut away or beveled on the upper front edge to correspond to the bearing-sun face of the lile and the aiigle at which. it is set in order to bring the cutting-surlace of the tile in contact with the saw-tecth at an oblique angle and in accordance with the shape oi the same. The clamping-plate is ad justably secured in place by means ot' the screws 7i. Both sides of the teeth may be dressed or jointed with the same facility, as the tool D2 may be used on either side of the saw. By this arrangement-a. saw may be conveniently held and dressed in the most expeditious manner possible and have e very tooth alike.

Having thus described my invention," what l claim, and desire to secure by Letters Patent, is-f l. The con'ihination, with the supportingframe, ot' a cap-plate rigidly mounted on one side of the trame, the vertical levers pivoted at their lower ends to said frame, a cam-shaft journaled in both said levers and frame, a second cap-plate rigidly mounted. on the upper ends of said levers, and the clamping-bars mounted on the top of the respective cap plates, whereby the movement of the camshaft throws the clamp into or out of a clamping position, substantiallj`- as and ior the purpose set forth.

2. In a device ot thc character described, the combination, with the cap-plates and the clamping-bars, ot' the bolts d'1, whereby said bars may be sprung or forced upward at the ends, substantially as and :For the purpose sot forth.

3. In a device oi' the character described, the combination, with the supporting-frame,

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ol' the rack-bars notched in the upper Vend and having a vertical movement7 a rock-shaft journaled in the frame, and the pinions mounted on the rock-shaft and engaging with the lower toothed end of said rack-bars, substantially as and for the purpose set forth.

4. The combination, with the rack-bars and the rock-shaft, ot' the pinions mounted on the latter, and the springs coiled on the respective ends ol' said shaft7 whereby the rack-bars are automatically forced upward when the hand clamping-screws are relaxed, substantially as and for the purpose set forth.

5. The combination, with the frame having openings U2 in the upper part, of the rack-bars, and provided on their upper ends with guidelugs which tit into said openings, the guidebraekets bs b", and the hand-screws C, substantially as and for the purpose set forth.

G. Jointly with the clamping device herein shown and described, the supplementary hand-gage tool consisting of the plate D,pro vided in each corner with an adjustable screwset forth.

7. Jointly with the clamping-device herein shown and described, the supplementary hand-tool consisting of the plate D', grooved in the under side and provided with ledges d3, and the screws d, for clamping the iile in place, substantially as and for the purpose set forth.

8. J ointly with the clamping device herein shown and described, the supplementary hand-tool D?, designed to hold a three-cornered file and consisting of the side plate, d6, the top plate, (Z7, grooved to receive one corner of the file, and the bottom or clamping plate, da, and screws for adj ustably-securing said plate, wherebya three-cornered file may be held to bring the cutting-face against the side of. the saw-teeth at an oblique angle, as set forth.

MILO COVEL.

Witnesses:

J. C. RANsoM, L. B. COUPLAND. 

